The purpose of regular maintenance of excavators is to reduce machine failures, prolong machine life, shorten machine downtime, improve work efficiency and reduce operating costs. By managing fuel, lubricants, water and air, failures can be reduced by 70%. In fact, around 70% of failures are due to poor management.
1. Fuel management
Different brands of diesel oil should be selected according to different ambient temperatures; diesel oil should not be mixed with impurities, lime soil and water, otherwise the fuel pump will be worn out prematurely; the paraffin and sulfur content in inferior fuel oil will cause damage to the engine; daily work After finishing, the fuel tank should be filled with fuel to prevent water droplets from forming on the inner wall of the fuel tank; before daily work, open the drain valve at the bottom of the fuel tank to drain water; after the engine fuel is used up or the filter element is replaced, the air in the road must be exhausted.
2. Grease management
The use of lubricating oil (butter) reduces wear on moving surfaces and prevents noise. When storing the grease, dust, sand, water and other impurities should not be mixed in; use lithium-based grease G2-L1, which has good anti-wear performance and is suitable for heavy-duty conditions; when filling, try to squeeze out all the old oil. And wipe clean to prevent sand from sticking.
3. Maintenance of filter element
The filter element plays the role of filtering impurities in the oil or gas path, preventing it from invading the system and causing failure; various filter elements should be replaced regularly according to the requirements of the (operation and maintenance manual); when replacing the filter element, check whether there is metal attached to the old If metal particles are found on the filter element, timely diagnose and take improvement measures; use the pure filter element that meets the requirements of the machine. The filtering ability of the fake and inferior filter element is poor, and the surface and material quality of the filter layer do not meet the requirements, which will seriously affect the normal use of the machine.
4. Contents of regular maintenance
①After the new machine works for 250H, the fuel filter element and the additional fuel filter element should be replaced; check the clearance of the engine valve.
②Daily maintenance; check, clean or replace the air filter element; clean the inside of the cooling system; check and tighten the bolts of the track shoes; check and adjust the back tension of the track; check the intake heater; replace the bucket teeth; adjust the bucket clearance; before inspection Window cleaning fluid level; check and adjust the air conditioner; clean the floor in the cab; replace the breaker filter element (optional). When cleaning the inside of the cooling system, after the engine is fully cooled, slowly loosen the water filler cap to release the internal pressure of the water tank, and then water can be discharged; do not clean the engine while the engine is working, the high-speed rotating fan will cause danger; when cleaning or replacing the cooling When using fluid, the machine should be parked on level ground; the coolant and anti-corrosion device should be replaced.
③ Check items before starting the engine. Check the coolant level (add water); check the engine oil level, add oil; check the fuel level (add fuel); check the hydraulic oil level (add hydraulic oil); check if the air filter element is blocked; check the wires; Check whether the horn is normal; check the lubrication of the bucket; check the water and sediment in the oil-water separator. ④Every 100 maintenance items. Boom cylinder cylinder head pin; boom foot pin; boom cylinder cylinder rod end; stick cylinder cylinder head pin; boom, stick connecting pin; stick cylinder cylinder rod end; bucket cylinder cylinder head pin ;Half rod connecting rod connecting pin; stick, bucket cylinder cylinder rod end; bucket cylinder cylinder head pin; stick connecting rod connecting pin; check the oil level in the slewing mechanism box (add oil); from the fuel tank Drain water and sediment.
⑤ Maintenance items every 250H. Check the oil level in the final drive case (add gear oil); check the battery electrolyte; replace the oil in the engine oil pan, replace the engine filter element; lubricate the slewing bearing (2 places); check the tension of the fan belt, and check the Adjust the tension of the air conditioner compressor belt.
⑥ Maintenance items every 500h. Carry out maintenance items every 100 and 250H at the same time; replace the fuel filter element; check the height of the rotary pinion grease (add grease); check and clean the radiator fins, oil cooler fins and cooler fins; replace the hydraulic oil filter element; replace the oil in the final drive box (only at 500h for the first time, and once at 1000h after that); clean the air filter element inside and outside the air conditioner system; replace the hydraulic oil vent filter element.
⑦Maintenance items every 1000h. Carry out maintenance items every 100, 250 and 500h at the same time; replace the oil in the slewing gear box; check the oil level (return oil) of the shock absorber housing; check all the fasteners of the turbocharger; check the turbocharger rotor Check and replace the tension of the generator belt; replace the anti-corrosion filter element; replace the oil in the final drive case.
⑧ Maintenance items every 2000h. First complete the maintenance items every 100, 250, 500 and 1000h; clean the hydraulic oil tank filter; clean and check the turbocharger; check the generator and starter motor; check the engine valve clearance (and adjust); check the shock absorber.
⑨Maintenance over 4000h. Increase the inspection of the water pump every 4000h; increase the replacement of hydraulic oil every 5000h.
⑩ Long-term storage. When the machine is stored for a long time, in order to prevent the piston rod of the hydraulic cylinder from rusting, the working device should be placed on the ground; the whole machine should be washed and dried and stored in a dry indoor environment; The machine is parked on a well-drained cement floor; before storage, fill up the fuel tank, lubricate all parts, replace the hydraulic oil and oil, apply a thin layer of butter on the exposed metal surface of the piston rod of the hydraulic cylinder, and remove the negative terminal of the battery. Or remove the battery and store it separately; add an appropriate proportion of antifreeze to the cooling water according to the lowest ambient temperature; start the engine once a month and operate the machine to lubricate the moving parts and charge the battery at the same time; turn on the air conditioner and run for 5-10 minutes.
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